Face detection:

Face detection homepage by Dr. Robert Frischholz
http://home.t-online.de/home/Robert.Frischholz/face.htm
(Software, links, publications, techniques)

Resource for face detection
http://vision.ai.uiuc.edu/mhyang/face-detection-survey.html#sample-code

Skin color detection overview
http://library.graphicon.ru:8080/catalog/8